Some code I'm looking at from a Plugin contains this line
add_settings_section("section", "Settings", null, "theme-options");
which has a
Having looked at https://codex.wordpress.org/Function_Reference/add_settings_section it says
$callback - (string) (required) Function that fills the section with the desired content. The function should echo its output.
So, why is this
null and what are the implications?